<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }
    .container {
      position: absolute;
      /* display: inline-block; */
    }
    .box {
      width: 100px;
      height: 100px;
    }

    .box1 {
      background: lightcoral;
      margin-bottom: 20px;
    }

    .box2 {
      margin-top: 20px;
      background: lightgreen;
    }
  </style>
</head>

<body>
  <div class="container">
    <div class="box box1"></div>
  </div>
  <div class="container">
    <div class="box box2"></div>
  </div>
</body>

</html>